How do you solve $log x + log 3 = log 21$ $log x + log 3 = log 21$ ?

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How do you solve $log x + log 3 = log 21$ $log x + log 3 = log 21$ ?

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Answer 1 · 2015-12-18T14:03:45

$\times \Rightarrow x = 7$ $color(white)(xx)=>x=7$

Explanation:

$\times log x + log 3 = log 21$ $color(white)(xx)logx+log3=log21$

The sum of the logarithms is the logarithm of a product of the numbers being added:

$\times log (3 x) = log 21$ $color(white)(xx)color(red)(log(3x))=log21$
$\Rightarrow \frac{1}{3} \times 3 x = \frac{1}{3} \times 21$ $=>color(red)(1/3xx)3x=color(red)(1/3xx)21$
$\Rightarrow x = 7$ $=>x=7$

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How do you solve $log x + log 3 = log 21$ $log x + log 3 = log 21$ ?

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How do you solve logx+log3=log21log x + log 3 = log 21?

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How do you solve $log x + log 3 = log 21$ $log x + log 3 = log 21$ ?